mac_vfs.c revision 168954
1170185Spav/*- 2170185Spav * Copyright (c) 1999-2002 Robert N. M. Watson 3170185Spav * Copyright (c) 2001 Ilmar S. Habibulin 4170185Spav * Copyright (c) 2001-2005 McAfee, Inc. 5170185Spav * Copyright (c) 2005-2006 SPARTA, Inc. 6170185Spav * All rights reserved. 7170185Spav * 8170185Spav * This software was developed by Robert Watson and Ilmar Habibulin for the 9 * TrustedBSD Project. 10 * 11 * This software was developed for the FreeBSD Project in part by McAfee 12 * Research, the Security Research Division of McAfee, Inc. under 13 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 14 * CHATS research program. 15 * 16 * This software was enhanced by SPARTA ISSO under SPAWAR contract 17 * N66001-04-C-6019 ("SEFOS"). 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sys/security/mac/mac_vfs.c 168954 2007-04-22 16:18:10Z rwatson $"); 43 44#include "opt_mac.h" 45 46#include <sys/param.h> 47#include <sys/condvar.h> 48#include <sys/extattr.h> 49#include <sys/imgact.h> 50#include <sys/kernel.h> 51#include <sys/lock.h> 52#include <sys/malloc.h> 53#include <sys/mutex.h> 54#include <sys/proc.h> 55#include <sys/sbuf.h> 56#include <sys/systm.h> 57#include <sys/vnode.h> 58#include <sys/mount.h> 59#include <sys/file.h> 60#include <sys/namei.h> 61#include <sys/sysctl.h> 62 63#include <vm/vm.h> 64#include <vm/pmap.h> 65#include <vm/vm_map.h> 66#include <vm/vm_object.h> 67 68#include <fs/devfs/devfs.h> 69 70#include <security/mac/mac_framework.h> 71#include <security/mac/mac_internal.h> 72#include <security/mac/mac_policy.h> 73 74/* 75 * Warn about EA transactions only the first time they happen. No locking on 76 * this variable. 77 */ 78static int ea_warn_once = 0; 79 80static int mac_setlabel_vnode_extattr(struct ucred *cred, 81 struct vnode *vp, struct label *intlabel); 82 83static struct label * 84mac_devfsdirent_label_alloc(void) 85{ 86 struct label *label; 87 88 label = mac_labelzone_alloc(M_WAITOK); 89 MAC_PERFORM(init_devfsdirent_label, label); 90 return (label); 91} 92 93void 94mac_init_devfsdirent(struct devfs_dirent *de) 95{ 96 97 de->de_label = mac_devfsdirent_label_alloc(); 98} 99 100static struct label * 101mac_mount_label_alloc(void) 102{ 103 struct label *label; 104 105 label = mac_labelzone_alloc(M_WAITOK); 106 MAC_PERFORM(init_mount_label, label); 107 return (label); 108} 109 110void 111mac_init_mount(struct mount *mp) 112{ 113 114 mp->mnt_label = mac_mount_label_alloc(); 115} 116 117struct label * 118mac_vnode_label_alloc(void) 119{ 120 struct label *label; 121 122 label = mac_labelzone_alloc(M_WAITOK); 123 MAC_PERFORM(init_vnode_label, label); 124 return (label); 125} 126 127void 128mac_init_vnode(struct vnode *vp) 129{ 130 131 vp->v_label = mac_vnode_label_alloc(); 132} 133 134static void 135mac_devfsdirent_label_free(struct label *label) 136{ 137 138 MAC_PERFORM(destroy_devfsdirent_label, label); 139 mac_labelzone_free(label); 140} 141 142void 143mac_destroy_devfsdirent(struct devfs_dirent *de) 144{ 145 146 mac_devfsdirent_label_free(de->de_label); 147 de->de_label = NULL; 148} 149 150static void 151mac_mount_label_free(struct label *label) 152{ 153 154 MAC_PERFORM(destroy_mount_label, label); 155 mac_labelzone_free(label); 156} 157 158void 159mac_destroy_mount(struct mount *mp) 160{ 161 162 mac_mount_label_free(mp->mnt_label); 163 mp->mnt_label = NULL; 164} 165 166void 167mac_vnode_label_free(struct label *label) 168{ 169 170 MAC_PERFORM(destroy_vnode_label, label); 171 mac_labelzone_free(label); 172} 173 174void 175mac_destroy_vnode(struct vnode *vp) 176{ 177 178 mac_vnode_label_free(vp->v_label); 179 vp->v_label = NULL; 180} 181 182void 183mac_copy_vnode_label(struct label *src, struct label *dest) 184{ 185 186 MAC_PERFORM(copy_vnode_label, src, dest); 187} 188 189int 190mac_externalize_vnode_label(struct label *label, char *elements, 191 char *outbuf, size_t outbuflen) 192{ 193 int error; 194 195 MAC_EXTERNALIZE(vnode, label, elements, outbuf, outbuflen); 196 197 return (error); 198} 199 200int 201mac_internalize_vnode_label(struct label *label, char *string) 202{ 203 int error; 204 205 MAC_INTERNALIZE(vnode, label, string); 206 207 return (error); 208} 209 210void 211mac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de, 212 struct vnode *vp) 213{ 214 215 MAC_PERFORM(update_devfsdirent, mp, de, de->de_label, vp, 216 vp->v_label); 217} 218 219void 220mac_associate_vnode_devfs(struct mount *mp, struct devfs_dirent *de, 221 struct vnode *vp) 222{ 223 224 MAC_PERFORM(associate_vnode_devfs, mp, mp->mnt_label, de, 225 de->de_label, vp, vp->v_label); 226} 227 228int 229mac_associate_vnode_extattr(struct mount *mp, struct vnode *vp) 230{ 231 int error; 232 233 ASSERT_VOP_LOCKED(vp, "mac_associate_vnode_extattr"); 234 235 MAC_CHECK(associate_vnode_extattr, mp, mp->mnt_label, vp, 236 vp->v_label); 237 238 return (error); 239} 240 241void 242mac_associate_vnode_singlelabel(struct mount *mp, struct vnode *vp) 243{ 244 245 MAC_PERFORM(associate_vnode_singlelabel, mp, mp->mnt_label, vp, 246 vp->v_label); 247} 248 249/* 250 * Functions implementing extended-attribute backed labels for file systems 251 * that support it. 252 * 253 * Where possible, we use EA transactions to make writes to multiple 254 * attributes across difference policies mutually atomic. We allow work to 255 * continue on file systems not supporting EA transactions, but generate a 256 * printf warning. 257 */ 258int 259mac_create_vnode_extattr(struct ucred *cred, struct mount *mp, 260 struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 261{ 262 int error; 263 264 ASSERT_VOP_LOCKED(dvp, "mac_create_vnode_extattr"); 265 ASSERT_VOP_LOCKED(vp, "mac_create_vnode_extattr"); 266 267 error = VOP_OPENEXTATTR(vp, cred, curthread); 268 if (error == EOPNOTSUPP) { 269 if (ea_warn_once == 0) { 270 printf("Warning: transactions not supported " 271 "in EA write.\n"); 272 ea_warn_once = 1; 273 } 274 } else if (error) 275 return (error); 276 277 MAC_CHECK(create_vnode_extattr, cred, mp, mp->mnt_label, dvp, 278 dvp->v_label, vp, vp->v_label, cnp); 279 280 if (error) { 281 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 282 return (error); 283 } 284 285 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 286 if (error == EOPNOTSUPP) 287 error = 0; 288 289 return (error); 290} 291 292static int 293mac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp, 294 struct label *intlabel) 295{ 296 int error; 297 298 ASSERT_VOP_LOCKED(vp, "mac_setlabel_vnode_extattr"); 299 300 error = VOP_OPENEXTATTR(vp, cred, curthread); 301 if (error == EOPNOTSUPP) { 302 if (ea_warn_once == 0) { 303 printf("Warning: transactions not supported " 304 "in EA write.\n"); 305 ea_warn_once = 1; 306 } 307 } else if (error) 308 return (error); 309 310 MAC_CHECK(setlabel_vnode_extattr, cred, vp, vp->v_label, intlabel); 311 312 if (error) { 313 VOP_CLOSEEXTATTR(vp, 0, NOCRED, curthread); 314 return (error); 315 } 316 317 error = VOP_CLOSEEXTATTR(vp, 1, NOCRED, curthread); 318 if (error == EOPNOTSUPP) 319 error = 0; 320 321 return (error); 322} 323 324void 325mac_execve_transition(struct ucred *old, struct ucred *new, struct vnode *vp, 326 struct label *interpvnodelabel, struct image_params *imgp) 327{ 328 329 ASSERT_VOP_LOCKED(vp, "mac_execve_transition"); 330 331 MAC_PERFORM(execve_transition, old, new, vp, vp->v_label, 332 interpvnodelabel, imgp, imgp->execlabel); 333} 334 335int 336mac_execve_will_transition(struct ucred *old, struct vnode *vp, 337 struct label *interpvnodelabel, struct image_params *imgp) 338{ 339 int result; 340 341 ASSERT_VOP_LOCKED(vp, "mac_execve_will_transition"); 342 343 result = 0; 344 MAC_BOOLEAN(execve_will_transition, ||, old, vp, vp->v_label, 345 interpvnodelabel, imgp, imgp->execlabel); 346 347 return (result); 348} 349 350int 351mac_check_vnode_access(struct ucred *cred, struct vnode *vp, int acc_mode) 352{ 353 int error; 354 355 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_access"); 356 357 MAC_CHECK(check_vnode_access, cred, vp, vp->v_label, acc_mode); 358 return (error); 359} 360 361int 362mac_check_vnode_chdir(struct ucred *cred, struct vnode *dvp) 363{ 364 int error; 365 366 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chdir"); 367 368 MAC_CHECK(check_vnode_chdir, cred, dvp, dvp->v_label); 369 return (error); 370} 371 372int 373mac_check_vnode_chroot(struct ucred *cred, struct vnode *dvp) 374{ 375 int error; 376 377 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_chroot"); 378 379 MAC_CHECK(check_vnode_chroot, cred, dvp, dvp->v_label); 380 return (error); 381} 382 383int 384mac_check_vnode_create(struct ucred *cred, struct vnode *dvp, 385 struct componentname *cnp, struct vattr *vap) 386{ 387 int error; 388 389 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_create"); 390 391 MAC_CHECK(check_vnode_create, cred, dvp, dvp->v_label, cnp, vap); 392 return (error); 393} 394 395int 396mac_check_vnode_delete(struct ucred *cred, struct vnode *dvp, struct vnode *vp, 397 struct componentname *cnp) 398{ 399 int error; 400 401 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_delete"); 402 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_delete"); 403 404 MAC_CHECK(check_vnode_delete, cred, dvp, dvp->v_label, vp, 405 vp->v_label, cnp); 406 return (error); 407} 408 409int 410mac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp, 411 acl_type_t type) 412{ 413 int error; 414 415 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteacl"); 416 417 MAC_CHECK(check_vnode_deleteacl, cred, vp, vp->v_label, type); 418 return (error); 419} 420 421int 422mac_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp, 423 int attrnamespace, const char *name) 424{ 425 int error; 426 427 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_deleteextattr"); 428 429 MAC_CHECK(check_vnode_deleteextattr, cred, vp, vp->v_label, 430 attrnamespace, name); 431 return (error); 432} 433 434int 435mac_check_vnode_exec(struct ucred *cred, struct vnode *vp, 436 struct image_params *imgp) 437{ 438 int error; 439 440 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_exec"); 441 442 MAC_CHECK(check_vnode_exec, cred, vp, vp->v_label, imgp, 443 imgp->execlabel); 444 445 return (error); 446} 447 448int 449mac_check_vnode_getacl(struct ucred *cred, struct vnode *vp, acl_type_t type) 450{ 451 int error; 452 453 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getacl"); 454 455 MAC_CHECK(check_vnode_getacl, cred, vp, vp->v_label, type); 456 return (error); 457} 458 459int 460mac_check_vnode_getextattr(struct ucred *cred, struct vnode *vp, 461 int attrnamespace, const char *name, struct uio *uio) 462{ 463 int error; 464 465 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_getextattr"); 466 467 MAC_CHECK(check_vnode_getextattr, cred, vp, vp->v_label, 468 attrnamespace, name, uio); 469 return (error); 470} 471 472int 473mac_check_vnode_link(struct ucred *cred, struct vnode *dvp, 474 struct vnode *vp, struct componentname *cnp) 475{ 476 int error; 477 478 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_link"); 479 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_link"); 480 481 MAC_CHECK(check_vnode_link, cred, dvp, dvp->v_label, vp, 482 vp->v_label, cnp); 483 return (error); 484} 485 486int 487mac_check_vnode_listextattr(struct ucred *cred, struct vnode *vp, 488 int attrnamespace) 489{ 490 int error; 491 492 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_listextattr"); 493 494 MAC_CHECK(check_vnode_listextattr, cred, vp, vp->v_label, 495 attrnamespace); 496 return (error); 497} 498 499int 500mac_check_vnode_lookup(struct ucred *cred, struct vnode *dvp, 501 struct componentname *cnp) 502{ 503 int error; 504 505 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_lookup"); 506 507 MAC_CHECK(check_vnode_lookup, cred, dvp, dvp->v_label, cnp); 508 return (error); 509} 510 511int 512mac_check_vnode_mmap(struct ucred *cred, struct vnode *vp, 513 int prot, int flags) 514{ 515 int error; 516 517 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap"); 518 519 MAC_CHECK(check_vnode_mmap, cred, vp, vp->v_label, prot, flags); 520 return (error); 521} 522 523void 524mac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp, int *prot) 525{ 526 int result = *prot; 527 528 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mmap_downgrade"); 529 530 MAC_PERFORM(check_vnode_mmap_downgrade, cred, vp, vp->v_label, 531 &result); 532 533 *prot = result; 534} 535 536int 537mac_check_vnode_mprotect(struct ucred *cred, struct vnode *vp, int prot) 538{ 539 int error; 540 541 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_mprotect"); 542 543 MAC_CHECK(check_vnode_mprotect, cred, vp, vp->v_label, prot); 544 return (error); 545} 546 547int 548mac_check_vnode_open(struct ucred *cred, struct vnode *vp, int acc_mode) 549{ 550 int error; 551 552 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_open"); 553 554 MAC_CHECK(check_vnode_open, cred, vp, vp->v_label, acc_mode); 555 return (error); 556} 557 558int 559mac_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred, 560 struct vnode *vp) 561{ 562 int error; 563 564 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_poll"); 565 566 MAC_CHECK(check_vnode_poll, active_cred, file_cred, vp, 567 vp->v_label); 568 569 return (error); 570} 571 572int 573mac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred, 574 struct vnode *vp) 575{ 576 int error; 577 578 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_read"); 579 580 MAC_CHECK(check_vnode_read, active_cred, file_cred, vp, 581 vp->v_label); 582 583 return (error); 584} 585 586int 587mac_check_vnode_readdir(struct ucred *cred, struct vnode *dvp) 588{ 589 int error; 590 591 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_readdir"); 592 593 MAC_CHECK(check_vnode_readdir, cred, dvp, dvp->v_label); 594 return (error); 595} 596 597int 598mac_check_vnode_readlink(struct ucred *cred, struct vnode *vp) 599{ 600 int error; 601 602 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_readlink"); 603 604 MAC_CHECK(check_vnode_readlink, cred, vp, vp->v_label); 605 return (error); 606} 607 608static int 609mac_check_vnode_relabel(struct ucred *cred, struct vnode *vp, 610 struct label *newlabel) 611{ 612 int error; 613 614 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_relabel"); 615 616 MAC_CHECK(check_vnode_relabel, cred, vp, vp->v_label, newlabel); 617 618 return (error); 619} 620 621int 622mac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp, 623 struct vnode *vp, struct componentname *cnp) 624{ 625 int error; 626 627 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_from"); 628 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_from"); 629 630 MAC_CHECK(check_vnode_rename_from, cred, dvp, dvp->v_label, vp, 631 vp->v_label, cnp); 632 return (error); 633} 634 635int 636mac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp, 637 struct vnode *vp, int samedir, struct componentname *cnp) 638{ 639 int error; 640 641 ASSERT_VOP_LOCKED(dvp, "mac_check_vnode_rename_to"); 642 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_rename_to"); 643 644 MAC_CHECK(check_vnode_rename_to, cred, dvp, dvp->v_label, vp, 645 vp != NULL ? vp->v_label : NULL, samedir, cnp); 646 return (error); 647} 648 649int 650mac_check_vnode_revoke(struct ucred *cred, struct vnode *vp) 651{ 652 int error; 653 654 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_revoke"); 655 656 MAC_CHECK(check_vnode_revoke, cred, vp, vp->v_label); 657 return (error); 658} 659 660int 661mac_check_vnode_setacl(struct ucred *cred, struct vnode *vp, acl_type_t type, 662 struct acl *acl) 663{ 664 int error; 665 666 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setacl"); 667 668 MAC_CHECK(check_vnode_setacl, cred, vp, vp->v_label, type, acl); 669 return (error); 670} 671 672int 673mac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp, 674 int attrnamespace, const char *name, struct uio *uio) 675{ 676 int error; 677 678 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setextattr"); 679 680 MAC_CHECK(check_vnode_setextattr, cred, vp, vp->v_label, 681 attrnamespace, name, uio); 682 return (error); 683} 684 685int 686mac_check_vnode_setflags(struct ucred *cred, struct vnode *vp, u_long flags) 687{ 688 int error; 689 690 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setflags"); 691 692 MAC_CHECK(check_vnode_setflags, cred, vp, vp->v_label, flags); 693 return (error); 694} 695 696int 697mac_check_vnode_setmode(struct ucred *cred, struct vnode *vp, mode_t mode) 698{ 699 int error; 700 701 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setmode"); 702 703 MAC_CHECK(check_vnode_setmode, cred, vp, vp->v_label, mode); 704 return (error); 705} 706 707int 708mac_check_vnode_setowner(struct ucred *cred, struct vnode *vp, uid_t uid, 709 gid_t gid) 710{ 711 int error; 712 713 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setowner"); 714 715 MAC_CHECK(check_vnode_setowner, cred, vp, vp->v_label, uid, gid); 716 return (error); 717} 718 719int 720mac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp, 721 struct timespec atime, struct timespec mtime) 722{ 723 int error; 724 725 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_setutimes"); 726 727 MAC_CHECK(check_vnode_setutimes, cred, vp, vp->v_label, atime, 728 mtime); 729 return (error); 730} 731 732int 733mac_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred, 734 struct vnode *vp) 735{ 736 int error; 737 738 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_stat"); 739 740 MAC_CHECK(check_vnode_stat, active_cred, file_cred, vp, 741 vp->v_label); 742 return (error); 743} 744 745int 746mac_check_vnode_write(struct ucred *active_cred, struct ucred *file_cred, 747 struct vnode *vp) 748{ 749 int error; 750 751 ASSERT_VOP_LOCKED(vp, "mac_check_vnode_write"); 752 753 MAC_CHECK(check_vnode_write, active_cred, file_cred, vp, 754 vp->v_label); 755 756 return (error); 757} 758 759void 760mac_relabel_vnode(struct ucred *cred, struct vnode *vp, struct label *newlabel) 761{ 762 763 MAC_PERFORM(relabel_vnode, cred, vp, vp->v_label, newlabel); 764} 765 766void 767mac_create_mount(struct ucred *cred, struct mount *mp) 768{ 769 770 MAC_PERFORM(create_mount, cred, mp, mp->mnt_label); 771} 772 773int 774mac_check_mount_stat(struct ucred *cred, struct mount *mount) 775{ 776 int error; 777 778 MAC_CHECK(check_mount_stat, cred, mount, mount->mnt_label); 779 780 return (error); 781} 782 783void 784mac_create_devfs_device(struct ucred *cred, struct mount *mp, 785 struct cdev *dev, struct devfs_dirent *de) 786{ 787 788 MAC_PERFORM(create_devfs_device, cred, mp, dev, de, de->de_label); 789} 790 791void 792mac_create_devfs_symlink(struct ucred *cred, struct mount *mp, 793 struct devfs_dirent *dd, struct devfs_dirent *de) 794{ 795 796 MAC_PERFORM(create_devfs_symlink, cred, mp, dd, dd->de_label, de, 797 de->de_label); 798} 799 800void 801mac_create_devfs_directory(struct mount *mp, char *dirname, int dirnamelen, 802 struct devfs_dirent *de) 803{ 804 805 MAC_PERFORM(create_devfs_directory, mp, dirname, dirnamelen, de, 806 de->de_label); 807} 808 809/* 810 * Implementation of VOP_SETLABEL() that relies on extended attributes 811 * to store label data. Can be referenced by filesystems supporting 812 * extended attributes. 813 */ 814int 815vop_stdsetlabel_ea(struct vop_setlabel_args *ap) 816{ 817 struct vnode *vp = ap->a_vp; 818 struct label *intlabel = ap->a_label; 819 int error; 820 821 ASSERT_VOP_LOCKED(vp, "vop_stdsetlabel_ea"); 822 823 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 824 return (EOPNOTSUPP); 825 826 error = mac_setlabel_vnode_extattr(ap->a_cred, vp, intlabel); 827 if (error) 828 return (error); 829 830 mac_relabel_vnode(ap->a_cred, vp, intlabel); 831 832 return (0); 833} 834 835int 836vn_setlabel(struct vnode *vp, struct label *intlabel, struct ucred *cred) 837{ 838 int error; 839 840 if (vp->v_mount == NULL) { 841 /* printf("vn_setlabel: null v_mount\n"); */ 842 if (vp->v_type != VNON) 843 printf("vn_setlabel: null v_mount with non-VNON\n"); 844 return (EBADF); 845 } 846 847 if ((vp->v_mount->mnt_flag & MNT_MULTILABEL) == 0) 848 return (EOPNOTSUPP); 849 850 /* 851 * Multi-phase commit. First check the policies to confirm the 852 * change is OK. Then commit via the filesystem. Finally, update 853 * the actual vnode label. 854 * 855 * Question: maybe the filesystem should update the vnode at the end 856 * as part of VOP_SETLABEL()? 857 */ 858 error = mac_check_vnode_relabel(cred, vp, intlabel); 859 if (error) 860 return (error); 861 862 /* 863 * VADMIN provides the opportunity for the filesystem to make 864 * decisions about who is and is not able to modify labels and 865 * protections on files. This might not be right. We can't assume 866 * VOP_SETLABEL() will do it, because we might implement that as 867 * part of vop_stdsetlabel_ea(). 868 */ 869 error = VOP_ACCESS(vp, VADMIN, cred, curthread); 870 if (error) 871 return (error); 872 873 error = VOP_SETLABEL(vp, intlabel, cred, curthread); 874 if (error) 875 return (error); 876 877 return (0); 878} 879 880/* 881 * When a thread becomes an NFS server daemon, its credential may need to be 882 * updated to reflect this so that policies can recognize when file system 883 * operations originate from the network. 884 * 885 * At some point, it would be desirable if the credential used for each NFS 886 * RPC could be set based on the RPC context (i.e., source system, etc) to 887 * provide more fine-grained access control. 888 */ 889void 890mac_associate_nfsd_label(struct ucred *cred) 891{ 892 893 MAC_PERFORM(associate_nfsd_label, cred); 894} 895